Moved my project folder, having trouble debugging

I still don’t know why this doesn’t work with my m.2 drive H:, but I tried a few different things.
Things that did not work: putting unreal AND project on H:\ rebuilding project from source to regenerate all VS files.
Things that did work: putting unreal AND the project back on G:\ drive

So I’m not sure if it’s the drive letter that’s the problem, the M.2 itself, or if my mobo maybe does some shadow mapping of the m.2 from H:\ to D:4\